<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <alert-text>有bug出现</alert-text>
        <alert-text>多处报错</alert-text>
        <alert-text></alert-text>
    </div>
    <script src="./vue.js"></script>
    <script>
        Vue.component('alert-text', {
            template: `
            <div>
                <strong>ERROR:</strong>
                <slot>默认内容</slot>
            </div>
            `
        })
        var vm = new Vue({
            el: '#app',
            data: {

            }
        })
    </script>
</body>

</html>